I like a Dreadlord concept a lot more. Turning into a swarm of insects/bats, being stealthy occasionally, hiding in shadows, hunting your target down, leeching the life out of them and perhaps spreading it to your allies with a Vampiric Aura.
Summons and casters are going to end up too Warlocky. There is window to give DHs more ranged spells but they still got to go melee.